﻿using System;

/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
namespace Sys.Workflow.Engine.Impl.Bpmn.Datas
{

    using Sys.Workflow.Engine.Delegate;
    using Sys.Workflow.Engine.Impl.Persistence.Entity;

    /// <summary>
    /// A data association (Input or Output) between a source and a target
    /// 
    /// 
    /// </summary>
    [Serializable]
	public abstract class AbstractDataAssociation
	{

	  private const long serialVersionUID = 1L;

	  protected internal string source;

	  protected internal IExpression sourceExpression;

	  protected internal string target;

	  protected internal AbstractDataAssociation(string source, string target)
	  {
		this.source = source;
		this.target = target;
	  }

	  protected internal AbstractDataAssociation(IExpression sourceExpression, string target)
	  {
		this.sourceExpression = sourceExpression;
		this.target = target;
	  }

	  public abstract void Evaluate(IExecutionEntity execution);

	  public virtual string Source
	  {
		  get
		  {
			return source;
		  }
	  }

	  public virtual string Target
	  {
		  get
		  {
			return target;
		  }
	  }

	  public virtual IExpression SourceExpression
	  {
		  get
		  {
			return sourceExpression;
		  }
	  }
	}

}